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ID = 20353
Great Britain (UK)
Developer: GEC, General Electric Co Ltd., GENALEX; London 
Tube type:  Transmitting Triode, air cooled 
Identical to VT90 = 8011 = REL1 = CV62 = 710A = CV1090 = WL-538 = 10E/97 = E1046
Similar Tubes
Normally replaceable-slightly different:
Successor Tubes D-160810   CV46  

Base Wires Sidecontact and top contact.
Was used by Radar
Filament Vf 8.25 Volts / If 7 Ampere / Direct

First 'micropup' VHF transmitting triode, developed in 1939 at GEC with the experimental code E1046. The anode was a copper tube, flared and taped at both ends, terminated by glass domes sealed by Housekeeper process. Thoriated-tungsten spiral-wound cathode was held by tungsten rods sealed to one of the domes. Grid was made of parallel molybdenum or tantalum wires welded between a ring and a base dish, in a structure which recalled a parrot cage. The base dish was welded to a tungsten rod sealed to the opposite dome.

  1. 9 kV peak anode voltage
  2. 100 W anode dissipation with forced-air cooling.
  3. Useful in pulsed operation to above 300MHz.

Used in British ASV MK2 airborne radar and in the US sets SCR-521 and ASE-1.
Several British, Canadian and US manufacturers and several product codes for this British military spec.

Information source -- Original-techn. papers.   Callick, Metres to Microwaves

Emilio Ciardiello

mpup.png VT90: Manufacturer's Literature
Emilio Ciardiello

VT90: Manufacturer's Literature
Emilio Ciardiello

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